﻿using System;
using NUnit.Framework;

namespace Drill.Configuration
{
	[TestFixture]
	public class ConfigurationLoaderTests
	{
		[Test]
		public void CanLoadAll()
		{
			// Arrange
			// Nothing to arrange.

			// Act
			IDependencyResolverConfigurationCollection configs = ConfigurationLoader.LoadAllDependencyResolverConfigs();

			// Assert
			Assert.That(configs, Is.Not.Null);
		}

		[Test]
		public void CanLoadWithNameArgument()
		{
			// Arrange
			const string name = "Default";

			// Act
			IDependencyResolverConfiguration config = ConfigurationLoader.LoadDependencyResolverConfig(name);

			// Assert
			Assert.That(config, Is.Not.Null);
		}

		[ExpectedException(typeof(ArgumentNullException), ExpectedMessage = "name", MatchType = MessageMatch.Contains)]
		[Test]
		public void CannotLoadWithNullNameArgument()
		{
			// Arrange
			string name = null;

			// Act
			// ReSharper disable ExpressionIsAlwaysNull
			ConfigurationLoader.LoadDependencyResolverConfig(name);
			// ReSharper restore ExpressionIsAlwaysNull

			// Assert
			// Nothing to assert because the test should throw an expected exception (see ExpectedException attribute).
		}

		[Test]
		public void CanLoadAllFromFile()
		{
			// Arrange
			string filename = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;

			// Act
			IDependencyResolverConfigurationCollection configs = ConfigurationLoader.LoadAllDependencyResolverConfigs(filename);

			// Assert
			Assert.That(configs, Is.Not.Null);
		}

		[Test]
		public void CanLoadFromFileWithNameArgument()
		{
			// Arrange
			const string name = "Default";
			string filename = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;

			// Act
			IDependencyResolverConfiguration config = ConfigurationLoader.LoadDependencyResolverConfig(name, filename);

			// Assert
			Assert.That(config, Is.Not.Null);
		}

		[ExpectedException(typeof(ArgumentNullException), ExpectedMessage = "name", MatchType = MessageMatch.Contains)]
		[Test]
		public void CannotLoadFromFileWithNullNameArgument()
		{
			// Arrange
			string name = null;
			string filename = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;

			// Act
			// ReSharper disable ExpressionIsAlwaysNull
			ConfigurationLoader.LoadDependencyResolverConfig(name, filename);
			// ReSharper restore ExpressionIsAlwaysNull

			// Assert
			// Nothing to assert because the test should throw an expected exception (see ExpectedException attribute).
		}
	}
}